213001121 has 2 divisors, whose sum is σ = 213001122. Its totient is φ = 213001120.

The previous prime is 213001073. The next prime is 213001123. The reversal of 213001121 is 121100312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205520896 + 7480225 = 14336^2 + 2735^2 .

It is a cyclic number.

It is not a de Polignac number, because 213001121 - 2⁶ = 213001057 is a prime.

Together with 213001123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213001123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106500560 + 106500561.

It is an arithmetic number, because the mean of its divisors is an integer number (106500561).

Almost surely, 2^213001121 is an apocalyptic number.

It is an amenable number.

213001121 is a deficient number, since it is larger than the sum of its proper divisors (1).

213001121 is an equidigital number, since it uses as much as digits as its factorization.

213001121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 213001121 is about 14594.5579241031. The cubic root of 213001121 is about 597.2103096672.

Adding to 213001121 its reverse (121100312), we get a palindrome (334101433).

The spelling of 213001121 in words is "two hundred thirteen million, one thousand, one hundred twenty-one".